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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4015658fce70bbe32424663de3bbff2ee81a9b3a5a6c93a7ea2e527ab3f3dbe6' 
  AND token = 'rdjm9Pkpo4ONM2gM0ulWgd5MvdLYB9NJ2GxrqRPsIRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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