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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f5cf838bf1add946a058ce917be87336eb8f08c9b6a3e67f92e1c653712e8a2' 
  AND token = '911ypC7ebWF4+KZL0nhs76jy9+swDpeDeoIsKrmYg/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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