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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37eb05adc290b7927335fe68ac1ac7a18db6215731a125c57f3a6fdf5cc9a153' 
  AND token = 'JCK+ZdHS44dzufbKs0obUaH400kMaJ3Vgg9Bcm+9qx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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