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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91ed4b061026349b1ab192322ffaeb6ae9192a7a2ace036d570ed0794c71749d' 
  AND token = 'vtqkpFLgz4+1TP+1w3Xo9xY2GGQGxFAb3ynNsxv06W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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