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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc26be53442f06c023a694e585428edd87b63c45a8e8135606a0d1670a924655' 
  AND token = '/xOnQ12HeLa40LFaywja8t2boxr40kFy7eTAnQxBqXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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