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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b88db3c536c94bc298c8bd821c07651fd33f61c0079d29a37c37d902fd598292' 
  AND token = 'OY8vVuxf+7co31yhs/vSxKcDNkvrjczTWNhAf88Dt0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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