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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19c04063d97a827f949d79a66b7b95317da9dc159d79d5c81096b600b18ee487' 
  AND token = 'un18rVhtev5r6IK1kZH/R7iGN3+2Pw6Z7iGAVUel8No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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