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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f515b2f580dbf905d42bf3d7a82f42b6067fdff2675079c1542cb6175740fe1b' 
  AND token = 'LGK0qEbfE/KQ5ST/uGuxbMXDVvWg4XoNZPLkcEbrdg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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