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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '711dc7d4334dae5aae4646f26b3340986476b1c2a10dce5639cf5fb5d23921f9' 
  AND token = 'uKO2cxaKJ3oORCUzMAb+sgt5AI7IEU6Qrlw53grSZWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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