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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82ded476d718ccb5e4eabe9f9509d1aa6d98c202ad76a594f4e7675bddfd21fd' 
  AND token = 'AwLbp2T9x+OTpOKDOz/ckDrF3iq2WRFPhHYTcNAugS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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