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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1758ea7c072f4ef9cd06aafc591dae0d5158d8278de0034d0ffb46bd530ada4' 
  AND token = 'BbecVstnDR/N+eS+joq7Y0xfjvIJAsCKEHlD9Z2E0Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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