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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48e1866e6b4ec6af23dfd03c559e0b21b09eacdb3158550959ad6a56b6c4b32e' 
  AND token = 'xiLkLhcft8nfTYgX7/YaXLV/EoYVidQBCjcMgBBMeps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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