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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b4cb9548570824a3993f76f5c8b39547faa12e0f0e80d344537044bfbfb039f' 
  AND token = 'faA2oJ9Ti5dN0MRB/v3UVT62ycFHQJywjuzFLEEMB0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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