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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0ed47f9611021d97b745e09bb66ce21e80056f6ebb5ca7b2c598868bbf3dfa2' 
  AND token = 'F2BsIpEZs1eeWL55WTNglfTiQeblF4RbCjxyx3IHTUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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