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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61ee659038a736d81a5dd39fdaacc42b9f0f796ab7018e7237a7133edb03a698' 
  AND token = 'Fxr+7DiDK9awvFSOyDlTnQJmFFoiUlal9XsRuc5pXUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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