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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e29579ae29e7a48523325cec0bddaf7e06ce49bf19be244116f365ee6542af6b' 
  AND token = 'tnN8E53kUDdUBYYiBpKsJdr7K1uGvflm2hN32eVBbhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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