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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a93ed778d39af5f1b2256f44f758f8f8b1a775b08de7af43792b972328b553a2' 
  AND token = '0dOjtCw1d5DALC0ZC/qg2rRxoWOi0ekdSC2OtwQqdUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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