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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7b69ef1c46129e84df61d22fc79f79f0b24cf0f915b8edaf1d7d82f5169d498' 
  AND token = '0r0cLWkqG2DXgnPk1Zb1ufhzRfe408bFsoaiEwqsowg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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