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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8079ff401e18687d3599c9899a6e831e6dea4ae91129165fab5f87dd71947468' 
  AND token = '6UD9XzhN//jFRKEXN+6bSyl/jun6s0+7eKKjKv7mXpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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