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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a91e0bb0bea812bddb16bc4b20ae5f22b1c861bdf92c554a5286b198c949be3' 
  AND token = 'sCce4S+QVphjKCwWj+85a4WcZAQ9wYAZ4VA5j9RPBe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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