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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c42a15901205be16d8052942c137106c2bbb9bacac91fd0bb245cd4d7b31c745' 
  AND token = 'E12GmeVcFCxHjE6JVu8n7qdcQ7NtwrzEWxoozDyheX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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