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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfdf2c640ad91e04964913f3000b12ea3e6bf8e32609517b59c8823efc089e0c' 
  AND token = '0bCaDc3DAVFKRhNHt533KewSe5xTSMNiWUcfiPx94y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00200

JSON explain

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