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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ade0d16deb9984e0e3484aa89cfda1d7e8cee87ff166e2890b08f8a31f8b298' 
  AND token = 'Zf6jxd0875ml2X//aP6bZv+bbqHHU8AHgDTBD6VDOYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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