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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f83ea5bc7fcad6c9871fe7c8bb13e69c25ee2f019360db276de6a395f4fe199d' 
  AND token = '/jmZbHbw9yR3DWydX/5zomLEPIrGq+RbuczmbtKU/2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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