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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9890776a271c8b80160ea1c5b50afcb192ddf7282ee5840473050a09bbf5ee05' 
  AND token = 'h8n4WiqPqkL0W7qXWrAU+qIqyRQ2+JqqZ+Oewb1niqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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