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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '772366feeb847f9b9c8c7f67a063b884cee723eb74d54b7c9ef69cb5fff741a3' 
  AND token = 'qEMsQnJAIOUfwpCEC+hjnyh1c0ag8X9uhGOC0p1cWTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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