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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d2a051f2733e5fecea06d46c4212553d6c821baa2d345d2ebaab77e1870ea55' 
  AND token = '/FS3OAoKKi7u+M2fQhaWZf48qyLbSHWUdcgqZoVEOII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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