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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1331bf6a4d54773cf94e9d8b6284e93051c558bdf2b9f1bdfcefdd4ad25761fe' 
  AND token = 'vU++CqEnk58lEXfRiyHkhcc4uu2UKGJXEIPsjxls5Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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