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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '548d92e85acce99f7fe3833e2e95b3eaea770ac10ffcfe0a9c671c6c18f3f81e' 
  AND token = 'NebaPKjSW/szX+/KIow7iCToNw6Cnxxap+cuhbKMGbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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