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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0fd8e4a0b3e36d44b9e22f1a3a2b24b6dcb469a06fbc083d95703f65da47e30' 
  AND token = 'j1NXW1UX3SHz3t8MaowCFKYwa7zpbtzUgshBb/kbLEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}