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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd918bc96a9ff6ea6ebe66729a460dfb2f95debed1dfe87b4a94764b854185742' 
  AND token = '6QOSDHdxbK5P0poCuCTAiPYvIgDGashmP97T0Qi9SQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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