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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b4f98177000cd5fabee1eb623ee6e43e3e106c7baae42cbd12bcb8abc146e8e' 
  AND token = 'Pz2UEV7lwW+sL9A3FTM9jqmaZDDS+t0D+WzgZoDNw3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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