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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8624ce99d34213b8875df181ed7eaeba51c5b2f954240a4fc1a4fe2908d37bb' 
  AND token = '9hE0j8ft3UD0snim+MtN6X3HruFf0OaNHNsjKSVkoeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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