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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ddcd48562528dfdc5de93d28ed4dc398f03ec428a152c70cbf3c35191b16645' 
  AND token = 'ZJUCHP3OArpjL8ls9rEsh202I2pUZr80oLWR+QGezjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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