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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0a75bc1e2d1329077dc70bebf0fd55c395c112691d2a797c1091581939fc6f6' 
  AND token = 'ezZLRJKg1Iky2hgjk1Wyq5MfaIiVYRGRL0M/kOZQgsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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