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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f75406756b11c4522731f6489d4508aa9bab5843fab058a0fa05715530084515' 
  AND token = 'xpcL93idjPMNi+2GKhKLxVeRYe4GdOG/WeFgzTLfdbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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