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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d14ec2dd89e39c1aae7d3a17b12e25e44455b0ca82f53d50d8339e99c9a1c09' 
  AND token = 'fgcW/G6YmZ7O6V2pIxHLGxiFv59lU/ksJtImCnccEQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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