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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65e7e7cba10a79dbf3c5da029b1f65c656c357727328ad00c2b982612006dc4e' 
  AND token = 'xCls8/odL+qRjkk9lnE3MAGPa9IJ3IklXaH0ugbZVho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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