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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58e5d00316763995f1c9e2db7c79524ecbf71f70b51db5c7b7676bce72a3599e' 
  AND token = 'foK3ecetL6emnV/0uBUCXZEQs68dQ4D4Sq+rfp6Sk+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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