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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69a27ca1c03220730be75ce4862f1817dd441898ad4017b0a7fe6a17873b3c4b' 
  AND token = 'xomExt2YeB11X8gJZQZxcDIOr0W8tLz/LRaT9/zjGjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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