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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94a1a337fcbf5f2c4627f46e393391e325cf0602ddb04f2b19151cbe8ab2a9a0' 
  AND token = '7QOl6ctl+8e1Aj+7mAGnqm7fWUzVO4sNwR2dE/MjtTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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