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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc091e07b3c5806155cf234315e52545629f0d50ce1428662384aa7bcef33957' 
  AND token = 'TPBNJH/MKha3MsEc+aaOtcZHlnCiUHvFIDvpF1OrLqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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