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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b4c68febfc268d4f5a69717ae389185c7ae8218b6b75bc9b21f780afe078717' 
  AND token = 'HFBOC19Tcnh0gWI6mEWLmOPrJ8SVvbLuYuMVdB4ZbN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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