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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6be2a3fd59c0dda25429bd95a4e4a8bbd19239fbbdf19c8b078ed41e668d6e9f' 
  AND token = 'GJnZ83NVJOvj2RV9thehjGgrzjSVw5Msae1ex/a0S3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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