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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87bcadf36a4d188c113073de5de015d23d77ccfa6847d9330a1d9c551fd44aaf' 
  AND token = 'IiGyTvLiAwxDSA8HDJO3MM67LviPVFn7uQzBlqVWBPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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