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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec466ebe4a858105fb7c92cd22984f9fab978f536b7eb74f5490af53eed24e48' 
  AND token = 'LCIuEhD0j34FYl12v06GcQbCWGxiNX2LLieY3ZqY0xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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