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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5534a086c1a3276c18913ed2aeb0873682c9597333708589c29e951f13c89364' 
  AND token = '9ahPmX+qJwpbs2SxPQnqxkPF5J32gWWziJ9MBFKI024=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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