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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '756ea09cb7f5debc0174bdfbf064d89ab7b7af73d155355b532a58cb7a60f7eb' 
  AND token = 'yj9R3e3taafu1rFe2hqCoW5tKMz+hUkL2IvmFsVDIdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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