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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f07aa0112b6d3a6313cc1bcc6448495d3e7814a20cba34b187c31a48c6ef426f' 
  AND token = '20ys4CS6KOE+2PCy82Widr+eu23SBw2pcDxZFQPvP1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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