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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25fa14e6c43bae229935ea968f07322f29ecaf2671bc5d3de502c92bbfff4932' 
  AND token = 'Sk2ftpMID79yVa9wqLnKBVF4xsaDB8jiXDMuKC+siL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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