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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ad6b0436b975192cb28c0e7a41986d2756bef91d690f1589fd8a6289dbc1918' 
  AND token = 'RAW2BTRPZq97UrO81+PQPI5NRsAG1VULAd8oUX6uTV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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