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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f752c76853bb89b231b58fcef3bc662a491dd95a80460bf460d0f2ae7272c57f' 
  AND token = 'odbzG9AU8Q1chfgvXpgESH73+MIg1N/tXs0Liae6JAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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