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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d2cc5b8995ed719611fb6971b8b1e43ebf36d16111035ad391158e54d1dfb56' 
  AND token = '6fvjmzaFUbZATOzGLfPZVFxo5fP24woXAgnHEDM0SfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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