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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e9897a4790a64595de3a949d28a0e3b1655a3e5e0d0a4d6ff6cb339f4cfad00' 
  AND token = 'Wml3pyyeEk9qPGTymLo1U1QQUMPKmwz1eu7WtTi8ISU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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