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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2957b1bf3fd83b92ac24ff24c33a994e424c51f54baedb21a1d16545ecadc1ee' 
  AND token = '51fSzgYrgEQzBxYErBcPxopS9peW1aQgX0QF5gQzUu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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