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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d4f72a4c985398abd0e10684e760c7e728dde8ea86d1de63399a08aa74c8ff1' 
  AND token = '0zFBlB13lITHMinTddnf6amoPJf/Lz5Ime0eSmQKhVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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