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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f1762392bdd971ebcfdd4113ff8ae5e23a5bed8c17a8d4f6cf952a0c56949b8' 
  AND token = 'Qw5g9dzrYrJq5yuFvKpa1v14bRxcb8RP633iNNb3KyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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