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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '365b8e63c827a5fa88a2b0d59191b0bf3ea90213b25e2f20eac403085123887e' 
  AND token = 'joODmQ5HwVMjV35ADeFjq5mAU2iVMV7AFpzpYVrqhH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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