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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c0a2e0324d35e2c60c84c498c27dc3eced832120b2be94af3b457ebe7404c06' 
  AND token = 'w8M5cDy4vK5VoE3N3yqG3xMD2kTobmIbqeZLjie6N8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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