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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90c4e7d18a7bde165dd954df28b01e457098f2db53d254f01d8bab6c5dfe0951' 
  AND token = '+ap1nWt+IpAxxFInSLOkNwk6auQLJCZict25rIZgF04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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