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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f6aacb5462f82e973b4044f6bede79d0bed3ccacf222b3fb6d0bc1ae79a7410' 
  AND token = 'ReSh8eD5eYbWFNHku7xITdAOUTai21shvTpkylPvgmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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