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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ded5be4e5cf913637f9bbc8a832f799c766fe5490b71745b7157b0faa55260fc' 
  AND token = 'oatCBsm/ccP1Y0fIK6hYdYv7cTnFr1hAIqUOkX5P8hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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